Consolidated Statements of Income (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Revenues
Premiums	$ 2,841.0	$ 2,546.4	$ 2,484.9
Net investment income	247.2	252.1	258.7
Net realized investment gains (losses):
Total other-than-temporary impairment losses on investments	(9.4)	(42.2)	(113.1)
Portion of loss transferred (from) to other comprehensive income	(4.5)	9.3
Net other-than-temporary impairment losses on investments recognized in earnings	(13.9)	(32.9)	(113.1)
Net realized gains from sales and other	43.6	34.3	15.3
Total net realized investment gains (losses)	29.7	1.4	(97.8)
Fees and other income	34.3	34.2	34.6
Total revenues	3,152.2	2,834.1	2,680.4
Losses and expenses
Losses and loss adjustment expenses	1,856.3	1,639.2	1,626.2
Policy acquisition expenses	669.0	581.3	556.2
Loss (gain) from retirement of debt	2.0	(34.5)
Other operating expenses	413.8	377.2	333.6
Total losses and expenses	2,941.1	2,563.2	2,516.0
Income before federal income taxes	211.1	270.9	164.4
Federal income tax expense:
Current	5.7	51.2	17.5
Deferred	52.2	31.9	62.4
Total federal income tax expense	57.9	83.1	79.9
Income from continuing operations	153.2	187.8	84.5
Discontinued operations (Note 2):
Gain (loss) from discontinued FAFLIC business (net of income tax benefit (expense) of $0.3, $(0.9) and $(4.6) in 2010, 2009 and 2008), including gain (loss) on disposal of $0.5, $7.1 and $(77.3) in 2010, 2009 and 2008	0.5	7.1	(84.8)
Income from operations of discontinued variable life insurance and annuity business (net of income tax benefit of $2.9 in 2008), including gain on disposal of $1.3, $4.9 and $8.7 in 2010, 2009 and 2008	1.3	4.9	11.3
Loss from discontinued accident and health business (net of income tax expense of $0.1 and $0.4 in 2010 and 2009)	(0.3)	(2.6)
Income from the operations of AMGRO (net of tax benefit of $1.3 in 2008), including gain on disposal of $11.1 in 2008			10.1
Other discontinued operations	0.1		(0.5)
Net income	$ 154.8	$ 197.2	$ 20.6
Basic:
Income from continuing operations	$ 3.36	$ 3.71	$ 1.65
Discontinued operations:
Gain (loss) from operations of discontinued FAFLIC business (net of income tax benefit (expense) of $0.01, $(0.02) and $(0.09) in 2010, 2009 and 2008), including gain (loss) on disposal of $0.01, $0.14 and $(1.51) in 2010, 2009 and 2008	$ 0.01	$ 0.14	$ (1.66)
Income from operations of discontinued variable life insurance and annuity business (net of income tax benefit of $0.06 in 2008), including gain on disposal of $0.03, $0.10 and $0.17 in 2010, 2009 and 2008	$ 0.03	$ 0.1	$ 0.22
Loss from discontinued accident and health business (net of income tax expense of $0.01 in 2009)	$ (0.01)	$ (0.05)
Income from the operations of AMGRO (net of tax benefit of $0.02 in 2008), including gain on disposal of $0.22 in 2008			$ 0.20
Other discontinued operations			$ (0.01)
Net income per share	$ 3.39	$ 3.90	$ 0.40
Weighted average shares outstanding	45.6	50.6	51.3
Diluted:
Income from continuing operations	$ 3.31	$ 3.68	$ 1.63
Discontinued operations:
Gain (loss) from operations of discontinued FAFLIC business (net of income tax benefit (expense) of $0.01, $(0.02), and $(0.09) in 2010, 2009 and 2008), including gain (loss) on disposal of $0.01, $0.14 and $(1.49) in 2010, 2009 and 2008	$ 0.01	$ 0.14	$ (1.64)
Income from operations of discontinued variable life insurance and annuity business (net of income tax benefit of $0.05 in 2008), including gain on disposal of $0.03, $0.09 and $0.17 in 2010, 2009 and 2008	$ 0.03	$ 0.09	$ 0.22
Loss from discontinued accident and health business (net of income tax expense of $0.01 in 2009)	$ (0.01)	$ (0.05)
Income from the operations of AMGRO (net of tax benefit of $0.02 in 2008), including gain on disposal of $0.21 in 2008			$ 0.20
Other discontinued operations			$ (0.01)
Net income per share	$ 3.34	$ 3.86	$ 0.4
Weighted average shares outstanding	46.3	51.1	51.7